<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图    -->
        <el-card>
            <!-- 警告区域  -->
            <el-alert title="注意:只允许为第三级分类设置相关参数" type="warning" 
            :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类:</span>
                    <!-- 选择商品分类的级联选择框 -->
                     <el-cascader
                        v-model="selectedCateKeys"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 扩展行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" 
                                :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">
                                    + New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisable"
                    @click="addDialogVisible=true">添加属性</el-button>
                     <!--静态属性参数表格 -->
                     <el-table :data="onlyTableData" border stripe>
                        <!-- 扩展行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" 
                                :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">
                                    + New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <!--  -->
            <el-dialog :title="'添加'+titleText"
                :visible.sync="addDialogVisible"
                width="30%"  @close ="addDialogClosed">
                <!-- 添加参数的对话框 -->
                <el-form :model="addForm" :rules="addFormrules" ref="addFormRef" label-width="100px">
                    <el-form-item :label="titleText" prop="attr_name">
                        <el-input v-model="addForm.attr_name"></el-input>
                    </el-form-item>
                </el-form>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="addDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="addParams">确 定</el-button>
                </span>
            </el-dialog>
            <!-- 修改对话框 -->
            <el-dialog :title="'修改'+titleText"
                :visible.sync="editDialogVisible"
                width="30%"  @close ="editDialogClosed">
                <!-- 添加参数的对话框 -->
                <el-form :model="editForm" :rules="editFormrules" ref="editFormRef" label-width="100px">
                    <el-form-item :label="titleText" prop="attr_name">
                        <el-input v-model="editForm.attr_name"></el-input>
                    </el-form-item>
                </el-form>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="editDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="editParams">确 定</el-button>
                </span>
            </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            cateList:[],
            // 级联选择框配置对象
            cateProps:{
                expandTrigger:'hover',
                checkStrictly:true,
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态属性数据
            manyTableData:[],
            // 静态属性数据
            onlyTableData:[],
            // 控制对话框的显示和隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormrules:{
                attr_name:[{required:true,message:'请输入参数名称',
                trigger:'blur'}]
            },
            // 修改对话框的对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
            // 修改表单的验证规则对象
            editFormrules:{attr_name:[{required:true,message:'请输入参数名称',
                trigger:'blur'}]}
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const{data:res} = await this.$http.get('categories')
            // console.log(res.meta.status);
            if(res.meta.status !== 200){
                return this.$message.error('获取数据成功')
            }
            this.cateList = res.data
        },
        // 级联选择框中选项变化，会触发这个函数
        handleChange(){
            this.getParamsData()
        },
        
        // tab页签点击事件的处理函数
        handleTabClick(){
            // console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数的列表数据 
        async getParamsData(){
            // console.log(this.selectedCateKeys);
            // 控制级联选择器的控制范围 只能选第三级选框
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                // 没选到三级分类时  数据清空的bug
                this.manyTableData =[]
                this.onlyTableData = []
                return
            }
        // 三级 说明是第三级分类
        // 根据所选分类的id,和当前所处的面板，获取对应的参数
        const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
            params:{sel:this.activeName}
        })
        if(res.meta.status !== 200){
            return this.$message.error('获取参数列表失败')
        }
       
        res.data.forEach(item =>{
             item.attr_vals =  item.attr_vals? item.attr_vals.split(' '):[]
            //  控制文本框的显示与隐藏
            // 解决每一行自己的显示和数据，不要同时显示
            item.inputVisible = false
            // 
            item.inputValue = ''
        })
         console.log(res.data);
        if(this.activeName === 'many'){
            this.manyTableData = res.data
        }else{
            this.onlyTableData = res.data
        }
        },
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid) return
                const{data:res}=await this.$http.post(`categories/
                ${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 201){
                    return this.$message.error('添加失败')
                }
                this.$message.success('添加成功')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 
        async showEditDialog(id){
            // 查询当前参数的信息
           
            const{data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${id}`,{
                params:{attr_sel:this.activeName}
            })
           
            if(res.meta.status !== 200){
                return this.$message.error('获取参数失败')
            }
            this.editForm = res.data
            this.editDialogVisible =true
        },
        
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 提交修改参数
        editParams(){
            this.$refs.editFormRef.validate(async valid =>{
                if(!valid) return

                // console.log(this.editForm.attr_id);
                // console.log(this.editForm.attr_name);
                // console.log(this.activeName);
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName }
                )


                console.log(res.meta.status);
                if(res.meta.status !== 200){
                return this.$message.error('修改提交失败')
                }
                this.$message.success('修改参数成功!')
                this.getParamsData()
                this.editDialogVisible = false
            })
           
        },
        // 删除参数
        async removeParams(id) {
          const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => {
            return err
        })
        // 如参数确定删除,则返回字符串confirm
        // 如果参数取消，则返回字符串cancel
        if(confirmResult !== 'confirm'){
            return this.$message.info('已取消删除')
        }
        // console.log(id);
        const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
        console.log(res.meta.status);
        if(res.meta.status !== 200){
            return this.$message.error('删除参数失败')
        }
         
        this.$message.success('删除参数成功')
        this.getParamsData()
        },
        // 文本框失去焦点，或按下enter都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue =''
                row.inputVisible = false
                return
            }
        //如果没return 那么有输入的内容 
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible =false
            // 保存这次操作
            this.saveAttrValues(row)
        },
        // 点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible = true
            // 文本框自动获得焦点
            // $nextTick方法的作用，就是当页面上元素被重新渲染之后
            // 才会执行回掉函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
        })
        },
        // 删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrValues(row)
        },
        // 将对attr_vals保存到数据库
        async saveAttrValues(row){
            const{data:res} = await this.$http.put(
                `categories/${this.cateId}/attributes/${row.attr_id}`,
            {
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                return this.$message.error('修改参数失败')
            }
        
            this.$message.success('修改参数成功')
        }
    },
    computed:{
        isBtnDisable(){
            //需要禁用返回true,不需要则返回false
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return full
        },
        // 动态计算标题文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

// scoped防止样式的冲突
<style scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag {
        margin: 5px;
    }
    .input-new-tag{
        width: 150px;
    }
    
</style>